The Cove Palisades State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the The Cove Palisades State Park clear sky chart from 2005-11-06 to 2024-03-08.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	7% 7% 3 6% 5% 3 5% 5% 5% 7% 47%	78506
	Night	8% 8% 3 7% 6% 3 5% 5% 6% 7% 42%	81080
Transparency	Day	39% 3 11% 23% 17% 7%	78209
	Night	43% 4 13% 22% 14% 4	80898
Seeing	Day	10% 14% 26% 27% 17% 6%	13679
	Night	10% 9% 23% 37% 20% 2	22893

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	10% 13% 4 10% 8% 5% 7% 6% 7% 8% 22%	2539
	11th to 20th	Day	16% 15% 6% 10% 8% 4 6% 5% 5% 5% 20%	2540
	21st to end	Day	10% 12% 5% 9% 9% 4 6% 5% 6% 8% 26%	2985
February	1st to 10th	Day	8% 12% 4 8% 7% 3 6% 6% 6% 8% 32%	1710
	11th to 20th	Day	9% 9% 4 6% 7% 4 7% 7% 6% 8% 34%	1665
	21st to end	Day	6% 10% 4 9% 6% 3 6% 7% 7% 8% 31%	1570
March	1st to 10th	Day	7% 9% 5% 8% 6% 5% 6% 7% 7% 10% 31%	1884
	11th to 20th	Day	7% 10% 4 7% 9% 5% 7% 6% 6% 8% 32%	1980
	21st to end	Day	7% 10% 5% 8% 8% 5% 7% 7% 6% 7% 29%	2276
April	1st to 10th	Day	9% 10% 4 7% 7% 5% 6% 7% 7% 8% 31%	2160
	11th to 20th	Day	7% 8% 4 8% 8% 4 5% 5% 7% 6% 39%	2129
	21st to end	Day	7% 5% 3 5% 5% 3 5% 5% 6% 8% 46%	2229
May	1st to 10th	Day	6% 6% 3 5% 6% 3 5% 4 5% 8% 50%	2520
	11th to 20th	Day	9% 5% 2 5% 6% 3 6% 5% 6% 8% 44%	2477
	21st to end	Day	10% 7% 4 5% 5% 3 5% 4 6% 8% 43%	2723
June	1st to 10th	Day	9% 7% 3 6% 5% 3 5% 4 6% 8% 45%	2520
	11th to 20th	Day	7% 5% 2 5% 5% 2 4 4 5% 7% 54%	2520
	21st to end	Day	4 3 1 2 3 2 4 3 4 6% 69%	2520
July	1st to 10th	Day	2 1 1 2 2 2 3 3 4 5% 76%	2520
	11th to 20th	Day	2 1 2 2 2 2 3 3 5% 77%	2520
	21st to end	Day	2 1 1 2 1 1 2 2 3 3 82%	2741
August	1st to 10th	Day	1 1 1 2 2 2 3 4 5% 5% 74%	2409
	11th to 20th	Day	2 2 2 2 2 2 2 3 6% 76%	2293
	21st to end	Day	2 2 1 2 2 1 2 3 3 5% 77%	2376
September	1st to 10th	Day	2 1 1 2 2 1 2 3 3 4 79%	2160
	11th to 20th	Day	3 3 2 4 4 3 4 5% 4 7% 61%	2160
	21st to end	Day	7% 6% 2 3 4 2 4 4 4 6% 58%	1926
October	1st to 10th	Day	7% 5% 2 5% 5% 4 4 6% 3 6% 53%	1800
	11th to 20th	Day	7% 6% 2 6% 5% 3 4 4 6% 9% 48%	1800
	21st to end	Day	9% 8% 3 5% 7% 4 6% 5% 5% 7% 43%	1888
November	1st to 10th	Day	9% 7% 5% 7% 7% 4 5% 6% 6% 7% 35%	1674
	11th to 20th	Day	9% 9% 4 9% 9% 5% 7% 6% 8% 8% 27%	1530
	21st to end	Day	8% 8% 4 8% 6% 3 6% 6% 7% 9% 35%	1520
December	1st to 10th	Day	9% 10% 4 7% 6% 4 6% 6% 6% 6% 37%	1520
	11th to 20th	Day	9% 11% 5% 9% 7% 5% 6% 6% 7% 11% 25%	1928
	21st to end	Day	8% 11% 6% 11% 8% 5% 6% 6% 6% 6% 26%	2794
January	1st to 10th	Night	9% 12% 5% 11% 10% 6% 7% 7% 7% 7% 18%	4406
	11th to 20th	Night	15% 15% 6% 10% 9% 4 5% 5% 5% 7% 20%	4420
	21st to end	Night	10% 13% 5% 9% 8% 5% 7% 6% 6% 7% 24%	4676
February	1st to 10th	Night	7% 10% 4 8% 8% 5% 6% 5% 7% 9% 31%	2470
	11th to 20th	Night	8% 11% 4 7% 7% 3 5% 5% 6% 8% 38%	2402
	21st to end	Night	7% 12% 4 8% 7% 4 5% 7% 5% 9% 31%	1884
March	1st to 10th	Night	9% 11% 4 7% 6% 4 6% 6% 7% 8% 32%	2232
	11th to 20th	Night	7% 8% 4 6% 7% 4 7% 6% 7% 10% 34%	1980
	21st to end	Night	5% 9% 4 8% 6% 5% 7% 8% 7% 9% 32%	2080
April	1st to 10th	Night	9% 10% 3 6% 6% 4 5% 5% 6% 8% 37%	1800
	11th to 20th	Night	8% 8% 4 7% 5% 4 6% 5% 5% 7% 42%	1779
	21st to end	Night	10% 7% 3 6% 4 3 5% 5% 6% 9% 43%	1725
May	1st to 10th	Night	7% 6% 2 5% 5% 3 4 4 5% 9% 50%	1440
	11th to 20th	Night	6% 6% 2 5% 4 3 5% 5% 6% 8% 49%	1416
	21st to end	Night	9% 5% 3 5% 4 3 5% 5% 6% 8% 46%	1552
June	1st to 10th	Night	10% 7% 2 4 5% 3 5% 4 6% 7% 47%	1440
	11th to 20th	Night	6% 4 2 4 4 3 4 3 4 8% 58%	1440
	21st to end	Night	5% 2 1 3 3 2 3 3 3 5% 69%	1440
July	1st to 10th	Night	2 1 1 2 1 3 3 5% 4 78%	1440
	11th to 20th	Night	1 1 1 1 1 1 2 3 4 5% 81%	1440
	21st to end	Night	1 1 1 1 1 1 1 2 2 4 84%	1576
August	1st to 10th	Night	2 2 1 2 2 1 2 3 4 6% 76%	1528
	11th to 20th	Night	2 1 1 1 2 2 3 3 4 5% 77%	1606
	21st to end	Night	2 1 1 2 2 1 2 3 3 5% 79%	1980
September	1st to 10th	Night	2 1 1 2 1 2 3 3 4 82%	1800
	11th to 20th	Night	4 2 2 4 4 2 3 3 6% 7% 64%	1800
	21st to end	Night	6% 4 2 3 2 3 3 4 4 7% 62%	2030
October	1st to 10th	Night	7% 5% 3 5% 4 2 3 4 5% 6% 56%	2160
	11th to 20th	Night	7% 4 2 5% 4 3 4 5% 6% 7% 54%	2160
	21st to end	Night	10% 7% 2 7% 5% 3 4 6% 5% 6% 46%	2466
November	1st to 10th	Night	10% 9% 3 7% 8% 4 6% 5% 5% 8% 35%	2405
	11th to 20th	Night	10% 8% 5% 8% 8% 5% 6% 6% 7% 8% 31%	2649
	21st to end	Night	6% 9% 3 6% 5% 4 7% 6% 7% 8% 40%	2660
December	1st to 10th	Night	9% 10% 5% 10% 6% 4 6% 5% 5% 8% 33%	2660
	11th to 20th	Night	9% 13% 6% 9% 8% 5% 7% 6% 6% 6% 23%	3276
	21st to end	Night	8% 12% 6% 11% 9% 5% 6% 6% 6% 6% 26%	4862

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	64% 3 13% 16% 3	2539
	11th to 20th	Day	69% 3 13% 10% 4 2	2540
	21st to end	Day	58% 3 16% 18% 5% 1	2985
February	1st to 10th	Day	52% 5% 15% 21% 7% 1	1710
	11th to 20th	Day	49% 5% 14% 22% 9% 1	1674
	21st to end	Day	49% 6% 16% 19% 8% 1	1570
March	1st to 10th	Day	52% 5% 12% 20% 12% 1	1884
	11th to 20th	Day	52% 4 12% 26% 6%	1980
	21st to end	Day	57% 5% 12% 20% 6%	2276
April	1st to 10th	Day	53% 4 12% 19% 12% 1	2160
	11th to 20th	Day	47% 4 13% 19% 14% 4	2132
	21st to end	Day	37% 4 13% 29% 14% 3	2229
May	1st to 10th	Day	35% 3 10% 31% 19% 1	2520
	11th to 20th	Day	40% 4 11% 27% 15% 2	2480
	21st to end	Day	42% 4 13% 26% 14% 1	2724
June	1st to 10th	Day	39% 4 11% 30% 15% 1	2520
	11th to 20th	Day	32% 3 10% 34% 17% 3	2520
	21st to end	Day	19% 3 9% 32% 27% 9%	2520
July	1st to 10th	Day	14% 2 7% 23% 31% 24%	2451
	11th to 20th	Day	13% 2 7% 14% 32% 32%	2445
	21st to end	Day	10% 2 3 16% 39% 31%	2589
August	1st to 10th	Day	14% 2 5% 26% 35% 18%	2392
	11th to 20th	Day	13% 2 5% 25% 35% 21%	2293
	21st to end	Day	13% 2 5% 28% 38% 15%	2376
September	1st to 10th	Day	12% 2 6% 27% 33% 20%	2160
	11th to 20th	Day	25% 3 9% 25% 26% 11%	2160
	21st to end	Day	29% 3 11% 27% 22% 10%	1926
October	1st to 10th	Day	35% 4 10% 23% 22% 7%	1800
	11th to 20th	Day	36% 4 15% 24% 18% 4	1800
	21st to end	Day	44% 3 11% 24% 16% 2	1888
November	1st to 10th	Day	49% 4 13% 23% 10% 1	1674
	11th to 20th	Day	54% 5% 16% 17% 7%	1530
	21st to end	Day	48% 5% 16% 19% 11% 1	1520
December	1st to 10th	Day	48% 6% 16% 23% 7%	1520
	11th to 20th	Day	55% 4 20% 18% 3	1928
	21st to end	Day	58% 3 14% 21% 3	2794
January	1st to 10th	Night	65% 4 15% 13% 3	4406
	11th to 20th	Night	67% 3 12% 11% 5% 2	4420
	21st to end	Night	60% 3 17% 14% 5%	4676
February	1st to 10th	Night	52% 5% 18% 17% 8%	2470
	11th to 20th	Night	46% 5% 16% 23% 8% 1	2404
	21st to end	Night	52% 6% 13% 20% 9% 1	1884
March	1st to 10th	Night	51% 6% 11% 21% 10% 1	2232
	11th to 20th	Night	46% 5% 17% 26% 5%	1980
	21st to end	Night	49% 8% 16% 19% 7%	2080
April	1st to 10th	Night	47% 5% 16% 21% 11% 1	1800
	11th to 20th	Night	45% 5% 14% 22% 12% 2	1779
	21st to end	Night	42% 6% 14% 25% 10% 3	1725
May	1st to 10th	Night	34% 3 14% 33% 15% 1	1440
	11th to 20th	Night	36% 5% 16% 30% 12% 2	1416
	21st to end	Night	38% 5% 17% 28% 12%	1552
June	1st to 10th	Night	38% 5% 14% 29% 12% 1	1440
	11th to 20th	Night	29% 3 14% 38% 14% 2	1440
	21st to end	Night	20% 2 11% 35% 25% 8%	1440
July	1st to 10th	Night	12% 3 11% 26% 29% 20%	1400
	11th to 20th	Night	9% 2 7% 21% 29% 31%	1392
	21st to end	Night	8% 2 2 18% 43% 26%	1488
August	1st to 10th	Night	12% 2 7% 29% 35% 15%	1520
	11th to 20th	Night	13% 2 7% 24% 38% 16%	1606
	21st to end	Night	12% 2 6% 29% 40% 12%	1980
September	1st to 10th	Night	10% 2 7% 29% 34% 17%	1800
	11th to 20th	Night	22% 4 10% 26% 26% 13%	1800
	21st to end	Night	27% 2 9% 27% 25% 10%	2030
October	1st to 10th	Night	32% 3 9% 27% 24% 5%	2160
	11th to 20th	Night	32% 3 15% 26% 19% 4	2160
	21st to end	Night	41% 4 13% 22% 18% 2	2466
November	1st to 10th	Night	50% 5% 12% 21% 12% 1	2405
	11th to 20th	Night	52% 5% 15% 23% 5%	2649
	21st to end	Night	44% 4 16% 22% 12% 1	2660
December	1st to 10th	Night	51% 5% 17% 20% 7%	2660
	11th to 20th	Night	60% 4 14% 17% 6%	3276
	21st to end	Night	57% 4 14% 20% 5%	4862

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	19% 17% 28% 21% 13% 1	180
	11th to 20th	Day	19% 9% 24% 33% 9% 4	180
	21st to end	Day	14% 15% 28% 23% 16% 3	311
February	1st to 10th	Day	17% 19% 26% 24% 13% 1	370
	11th to 20th	Day	14% 22% 32% 23% 8% 2	365
	21st to end	Day	15% 22% 28% 25% 8% 1	382
March	1st to 10th	Day	15% 18% 33% 25% 8% 1	449
	11th to 20th	Day	13% 22% 26% 24% 14% 1	420
	21st to end	Day	18% 21% 26% 25% 9%	462
April	1st to 10th	Day	17% 23% 25% 20% 11% 4	420
	11th to 20th	Day	15% 23% 29% 20% 8% 5%	412
	21st to end	Day	10% 25% 25% 24% 13% 3	420
May	1st to 10th	Day	10% 19% 28% 23% 15% 5%	423
	11th to 20th	Day	19% 13% 25% 23% 15% 5%	448
	21st to end	Day	12% 13% 23% 27% 18% 7%	485
June	1st to 10th	Day	10% 16% 21% 26% 18% 9%	450
	11th to 20th	Day	9% 19% 28% 26% 15% 3	450
	21st to end	Day	4 9% 24% 32% 23% 8%	450
July	1st to 10th	Day	2 8% 30% 30% 23% 7%	446
	11th to 20th	Day	2 8% 29% 25% 28% 9%	444
	21st to end	Day	1 6% 28% 29% 26% 10%	487
August	1st to 10th	Day	2 5% 24% 35% 23% 12%	447
	11th to 20th	Day	3 5% 18% 34% 24% 16%	437
	21st to end	Day	3 8% 23% 31% 23% 11%	495
September	1st to 10th	Day	3 7% 26% 26% 26% 13%	450
	11th to 20th	Day	5% 9% 22% 30% 26% 8%	450
	21st to end	Day	10% 12% 21% 30% 21% 5%	450
October	1st to 10th	Day	11% 11% 22% 30% 20% 7%	450
	11th to 20th	Day	13% 12% 22% 24% 24% 5%	450
	21st to end	Day	13% 17% 26% 20% 20% 4	403
November	1st to 10th	Day	14% 11% 28% 29% 15% 3	270
	11th to 20th	Day	10% 17% 21% 31% 15% 5%	185
	21st to end	Day	17% 14% 23% 27% 17% 3	180
December	1st to 10th	Day	12% 17% 24% 24% 16% 6%	180
	11th to 20th	Day	16% 16% 32% 27% 7% 2	180
	21st to end	Day	13% 19% 26% 29% 12% 2	198
January	1st to 10th	Night	14% 14% 28% 28% 13% 3	760
	11th to 20th	Night	13% 14% 26% 27% 18% 2	760
	21st to end	Night	13% 10% 23% 36% 16% 3	836
February	1st to 10th	Night	12% 11% 28% 33% 15% 1	760
	11th to 20th	Night	12% 11% 28% 35% 13% 1	744
	21st to end	Night	13% 15% 29% 34% 9%	628
March	1st to 10th	Night	13% 14% 27% 33% 12% 1	750
	11th to 20th	Night	9% 12% 26% 37% 14% 1	720
	21st to end	Night	8% 13% 32% 31% 15% 1	792
April	1st to 10th	Night	14% 12% 24% 30% 18% 1	720
	11th to 20th	Night	10% 13% 27% 31% 16% 2	711
	21st to end	Night	13% 10% 24% 35% 17% 1	645
May	1st to 10th	Night	9% 9% 20% 40% 21% 1	360
	11th to 20th	Night	10% 5% 19% 41% 24% 1	354
	21st to end	Night	8% 6% 17% 46% 22% 2	389
June	1st to 10th	Night	14% 5% 19% 42% 19% 1	360
	11th to 20th	Night	7% 4 26% 44% 17% 1	360
	21st to end	Night	6% 1 15% 52% 25% 1	360
July	1st to 10th	Night	2 1 11% 60% 24% 1	350
	11th to 20th	Night	1 17% 59% 21% 1	348
	21st to end	Night	1 1 11% 55% 30% 1	394
August	1st to 10th	Night	2 9% 48% 36% 4	454
	11th to 20th	Night	1 1 6% 41% 43% 7%	538
	21st to end	Night	2 3 18% 46% 29% 3	792
September	1st to 10th	Night	2 3 18% 42% 32% 4	720
	11th to 20th	Night	5% 3 13% 41% 32% 6%	720
	21st to end	Night	8% 4 16% 41% 27% 5%	720
October	1st to 10th	Night	9% 5% 20% 38% 25% 3	720
	11th to 20th	Night	8% 8% 20% 36% 25% 3	720
	21st to end	Night	12% 7% 24% 34% 18% 5%	792
November	1st to 10th	Night	11% 10% 25% 37% 16% 1	740
	11th to 20th	Night	13% 14% 25% 33% 15% 1	760
	21st to end	Night	10% 11% 26% 33% 18% 3	760
December	1st to 10th	Night	13% 10% 23% 34% 18% 2	760
	11th to 20th	Night	13% 10% 28% 34% 14% 1	760
	21st to end	Night	13% 17% 31% 29% 10% 1	836

Page generated at 2024-03-05 04:24:04. Version ac07

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